647123601 has 4 divisors (see below), whose sum is σ = 862831472. Its totient is φ = 431415732.

The previous prime is 647123597. The next prime is 647123621. The reversal of 647123601 is 106321746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 647123601 - 2² = 647123597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647123621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107853931 + ... + 107853936.

It is an arithmetic number, because the mean of its divisors is an integer number (215707868).

Almost surely, 2^647123601 is an apocalyptic number.

It is an amenable number.

647123601 is a deficient number, since it is larger than the sum of its proper divisors (215707871).

647123601 is a wasteful number, since it uses less digits than its factorization.

647123601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215707870.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 647123601 is about 25438.6241962886. The cubic root of 647123601 is about 864.9594470168.

The spelling of 647123601 in words is "six hundred forty-seven million, one hundred twenty-three thousand, six hundred one".